Half mask filter respirator



FIG. 1 is a front perspective view of a half mask filter respirator according to my new design,

FIG. 2 is a front view thereof,

FIG. 3 is a bottom view thereof,

FIG. 4 is a back view thereof,

FIG. 5 is a right side view thereof, the left side being a mirror image; and,

FIG. 6 is a top view thereof.

The broken lines in FIG. 4 illustrate environmental structure of the half mask filter respirator, which form no part of the claimed design. 

The ornamental design for a half mask filter respirator, as shown and described. 